Steam-pump



(No M-o'del.) l

J HENSHALL.

STEAM PUMP.

No.' 243,776. Patented July 5,1881.

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nyezim UNITED STATES' PATENT OFF-ICE. 4

JAMES HENSHALL, OF PHILADELPHIA, PENNSYLVANIA.

STEAM-PUMP.

SPECIFICATION forming part of Letters ,Patent No. 243,776, dated .Tu1y5, 1881.

Application filed May 26, 1881.

To alt whom it may concern Beitknown that I, J AMES HENSHALL, acitizenof the 4United States, residing at Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented certain new anduseful Improvements in Steam-Pumps; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to letters or figures of reference marked thereon,which form a partof this specification.

This invention relates to steam-pumps; and it consistsin certainimprovements in the operating mechanism, as hereinafter shown anddescribed.

In the accompanying drawings, Figurel represents a plan of a steam-pumpand its operating mechanism with my improvement applied thereto. Fig. 2represents a side view ot' certain details detached.

Referring to the drawings, A designates a shaft or spindle, having apiston, B, working in a steam-cylinder at one end, the other end of thespindle carrying a pump-plunger, C, in a tubular chamber, as shown.

Adjacent to the steam-cylinder is the chamber D, into which steam isadmitted through a pipe, a, the steam passing from thence into thesteam-cylinder to actuate the piston, and from thence past the cut-off'sliding valve b to the dischargeport c. The course of the steam is shownby the arrows indicated by 1, 2, and 3 respectively.

Adjacent to the tube or cylindrical chamber in which moves thepump-piston C is a waterchamber, E, with a sliding cut-oft' valve, d,located tberein, said chamberE communicating with the chamber ofpump-piston, as shown, and havin gadischarge-port, f. The water risesthrough .pipe g, and, passing the slide-valve d to the chamber of pistonC, goes from thence into the chamberE and through the discharge f, thecourse being clearly indicated by the arrows 4, 5, and 6 in thedrawings, from which (No model.)

i the operation of the parts above referred to will be readilyunderstood.

The oscillatingmovements of the slide-valves b and d, respectively, areeffected in the following manner: A pivoted rocking-lever, F, is locatedmidway under the spindle A, as shown, said lever at its extremitieshaving suitable connections, h and t', with the slide-valves?) and drespectively. To regulate the movements of valves the couplings of h andfi. to lever F are made adjustable by the slots m in the lever.

Acam, (indicated byG,) which is rigidly fastened to. lever F or madesolid therewith, extends from said lever at its center and in oppositedirections, so as to form two arms, each being somewhat in the form of alozenge,as shown in the drawings. The cam Gr has a vertical rim, lo,extending entirely around it,within which rim and centrally oneach armofthe cam are two raised surfaces, n, which are also somewhat lozenge-shaped, the purpose of this formation being to form a way in thesurface of the cam Vfor the movement of a vertical pin, p, carried bythe spindle A and extending into the way o'formed in the cam. The courseof the pin p in the way o is indicated by the dotted line, the pinmoving along the Way around each of the raised surfaces n, so that ingoing from one end of the cam to the other its track crosses atl thecenter. To insure the crossing movement of the pin in its passage theWay o is made somewhat flaring toward the center of the cam. Thus by themovement of the pin p in the cam G is effected the rocking movement oflever F, and motion is imparted to the valves -b and el respectively,the movements of said valves being limited by the cam and adjustable bymeans of the slots in the extremities of the rocking lever connectingwith the valves. In the direct-acting steam-pump a slide-valve is thusactuated by the movement of a cam of peculiar construction, having amovement that renders it impossible to bring the valve to a position toshut off steam and stop the pump. Owing to the peculiar form of the camfrom which motion is imparted to the slide-valve afull stroke isinsured, and,

further, the pump commences the stroke slow- 1y, giving the Water timeto fill the water-cylinder, insuring a full supply at every stroke, andpreventing the pump plunger from cush- 5 ioning against the water whenthe cylinder is but partly lled.

Having described my invention, I claim- In a steam-pump, thecombination, with the piston-spindle A, carrying a pin, p, the cam 1o G,having the crossing Way o and the rocking lever F, connecting With oneor more slide valves, all arranged substantially as and for the purposesdescribed.

In testimony whereof I sign my name inthe presence of two witnesses.

JAMES HENSHALL.-

Witnesses:

OTIs EGAN, Taos. D. MoWLDs.

